Think this is a bunch of bull. Humans are omnivores, we need meat and we need veggies. Look at anyone who has lived pass 100 years old. I happen to know a 103 years old and many 90- 100 years old individuals. I've asked them many times what their diets consisted of. Answer: Eggs, butter, sausage, roast beef, string beans, mashed potatoes and if they were italian pasta. Your best study consist of asking those who are 100 yrs old or older not giving a diet to a 50 year old and follow them around for 10 years. You see the people who are 100 years old are that old because they ate all those things that they tell you are not healthy now. By the way I don't know of any vegetarians who are 100 years or older.